Speaker



FIG. 1 is a top, front and left side perspective view of a speaker showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The elements shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a speaker, as shown and described. 